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A fun, free platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
1337crypt CTF Archive 0
Substitution Cipher III CTF Archive 0
1337crypt v2 CTF Archive 0
Signature CTF Archive 0
pekobot CTF Archive 0
Weekly Top Users
#1 drdoctor 2470
#2 h47d3n 1925
#3 Vector 1330
#4 GalHorowitz 1305
#5 Nics 1215
Recent Solves
Resisting Bruteforce SnickeyX
Hex Ranee
Keyed Permutations SnickeyX
Hex Hackerberg
Recent Solutions
Modular Binomials shynt04 0
Prime and Prejudice remy_o 1
RSA Backdoor Viability remy_o 1
Adrien's Signs shynt04 0
No Way Back Home joachim 0

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